Muffler for internal-combustion engines.



A. PETITO. MUFFLER FOB INTERNAL COMBUSTION ENGINES.

APPLICATION FILED IUNEZ?. 19|?.

Patented July 9, 1918.

HNDREA Femm ANDREA PETITO, OF TRENTON, NEW JERSEY.

MUFFLER FOB. INTERNAL-COMBUS'IION ENGINES.

Specification of Letters Patent.

Patented July 9, 1918.

Application led I une 27,'1917. Serial No. 177,326.

To all whom t may concern: A

Be it known that LANDREA PETiTo, a citi- Zen of the United States, residing at Trenton, in the county of Mercer and State of New Jersey, have invented certain new and useful Improvements in Mufflersr for Internal-Combustion Engines, ot' which the lol lowing is a specification, reference being had to the accompanying drawings.

This invention relates to mufllers for internal co-mbustion engines such as are used on motorcycles, automobiles, etc., and the general object of the invention is to provide an improved form of muiiler of such construction that the explosive sound of the exhaust will be very much deadened.

A further object is to provide a construction of this kind, in which a spring actuated valve normally closes the passage through the muiier, this spring actuated valve being opened by the exhaust gases to permit the exhaust gases to pass into the muffler proper at a reduced pressure.

@ther objects will appear in the course of the following description. My invention is illustrated in the accompanying drawings, wherein Figure 1 is a longitudinal sectional view of a mutller constructed in accordance with my invention;

Eig. 2 is a section on the line 2--2 of Fig. 1;

Fig. 3 is an enlarged sidel elevation of the valve operating lever and its support, the support being partly in section; Y

Fig. 4 is a top plan view ofthe support v for the lever;

Fig. 5 is a face view of several baille plates;

Fig. 6 is a 'face view. of one of the strips 19.

Referring to these figures, '10 designates a pipe connected to the exhaust pipe of the engine and 11 designates a relatively larger cylindrical casing which may be made of sheet metal, this casing having an opening 12 at one end into which the pipe'lO extends, this pipe being smaller in diameter than the opening. 13 designates a plate detachably connected to the end wall of the casing 11, and attached to this plate is a thimble 14 which engages thepipe 10. The plate is detachably held in the end wall 11 by means 'of screws 15, which pass through a flange on pipe 10.

Disposed within the casing 11 and operatively connected to the end wall thereof and extending into the opening 12 is a muffler pipe 16, preferably made of sheet metal. The pipe 10 extends into this mutller pipe and is spaced therefrom. The opposite end of the pipe 16 is closed by an end wall 17 having an opening 18. Extending longitudinally alongl the pipe 16 on its inside are the strips 19 which are notched at intervals as at 20 to receive baiile disks 21. Each of these disks is formed with .a passage 22 and each disk is notched at opposite points on its periphery as at 23 to lit over the stop 20. rlhese baille plates 21 are disposed in such relation to each other that the openings 22 are staggered so that each opening of one disk is opposed to a perforate portion of the next adjacent disk or baille, thus causing Vthe products of combustion to take a circuitous course. rlhe casing 11 at its outer end is formed with a relatively small opening to which is connected an outlet pipe 24.

Detachably mounted within the pipe 10, as by means of screws 25, is a spider 26,

which supports the concavo-convex web 27 having a central opening'28 constituting a valve seat. Seating in this opening is -a valve 29 having a stem 30, which has sliding engagement with the spider 26. For the purpose of normally holding this valve closed, l provide a lever designated generally 31, which at its inner end is operatively connected to ,the valve 39. The extremity of this lever may have a rearwardly extending stud 32 to bear against the valve 29. Mounted on the wall of the pipe 10 is a base plate 33 having Van upstanding post 34 formed at its upper end with asocketed head 35 to receive a spring 36. Extending upward fromthe base plate are the laterally disposed brackets 372 through which a pivot pin 38 passes, this pin passing through the lever 31. The upper end 'of the lever is laterally turned to faceV the socket in the head 35 and the spring 36 operatively engages the upper end of the lever. The base plate is slotted as at 39 and the upper face of the base plate is formed with a concave recess 40, which is concentric to the axis of rotation of the lever 31. The lever 31 is formed below its pivotalaxis with a con- `vex head 41, which bears in the recess 40 and has-close contact therewith. This head 41 bearing at all times upon the concave seat 40 closes the, slot 29 andpr'events the passige of products of combustion through the s ot, i

The operation of this muhier will heiobc vious from the drawing. At each exhaust the pressure of the gases will cause the valve 29 to open and the gases will pass, by

way of pipe 10, into the pipel and thence the gases Will pass through the pertorations 22 in the several bafiie plates and out through the opening 18 into the interior of the casing' ll and from thence will be discharged throughl the pipe 24. It will bev seen that this device is very simple, may be cheaply manufactured and is easily installed,

. and I have found in practice that it provides a very effective muiiier. rlhe cheek valve 29 checks the outward passage of the combustion products and at the same time prevents the return of these products. The 1oaes v21 still further check the gases and permit them to expand until iinally the gases pass into the casing 11 where they are iinally expanded and pass quietly out through the passage 24. While I have illustrated the particular embodiment of my invention, it will 'ne understood that many changes may be made within the scope of the appended claims without departing from the spirit thereof. Having described my invention, what l `claim is l. In a muiller, a pipe adapted vto he connected to the exhaust pipe of an engine, a

spider detachably mounted within. the saidV pipe and having a concave convex web formed with a'central valve seat, a valve coacting with sald seat and having a stem ex- 'tending through thespider, a lever extending A through the wall of the pipe and bearing at garages its innerend against the valve, and a spring against the outer end of the lever' brackets, a lever extending through said slot and ,pivotally mounted u on the brackets, a valve carried on one en of the lever and engaging the seat, and a spring extending from the post to the upper end of the lever and urging the valve to its closed position, the base being formed witha concaved recess and the lever having va convex head entimes preventing the passage of products of combustion through said' slot.

3. A muiher comprising a main pipe lead-i.

ing from the exhaust of an engine, a relatively large casing mounted upon the end of the main pipe, a muiiler pipe disposed within v gaging in the recess, said convex head at all v the casing larger 'than the main pipe 'andinto whichsaid main pipe-discharges, said muiher pipe for a portion of its length having laterally disposed notched strips, and a plurality of bathe disks mounted on said strips and having staggered per'forations,

the casing being formed at its outer end with a discharge opening. ln testimony whereof l Annata rnTiTo.

Witnesses: A

Jams F. Pnnn'rr, Grnsnrrn FIMIANO.

hereunto a'x my i signature in the presence of two witnesses. 

